Flora of North America species comparison

50-100 cm;

nodes usually glabrous.

20-250 cm;

nodes glabrous.

glabrous or finely pubescent, margins ciliate distally;

ligules of 1 mm hairs;

blades 15-20 cm long, 6-12 mm wide, flat or folded, often finely pubescent on both surfaces.

glabrous, sometimes scabridu-lous, margins ciliate distally;

ligules 1-2 mm, ciliate;

blades to 20 cm long, 4-25 mm wide, flat, scabrous or smooth, glabrous.

15-20 cm, loosely spikelike, interrupted, attenuate;

rachises often villous;

branches ascending, lower branches about 2.5 cm;

bristles usually solitary, less than 10 mm, antrorsely scabrous.

3-20 cm, densely spicate, nodding only from near the apices;

rachises hispid and villous;

bristles 1-3, 5-10 mm, antrorsely scabrous, usually green, rarely purple.

2-2.5 mm, ovate-lanceolate.

1.8-2.2 mm.

about 1/2 as long as the spikelets, 3-veined;

upper glumes about 2/3 as long as the spikelets, 5-7-veined;

lower lemmas equaling the upper lemmas;

lower paleas as long as the upper paleas, broad;

upper lemmas finely and distinctly transversely rugose.

about as long as the spikelets, triangular-ovate, 3-veined;

upper glumes nearly equaling the upper lemmas, elliptical, 5-6-veined;

lower lemmas slightly exceeding the upper lemmas, 5-veined;

lower paleas about as long as the lower lemmas, hyaline;

upper lemmas very finely and transversely rugose, pale green, 5-6-veined;

upper paleas similar to the upper lemmas.

= unknown.

= 18.